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<title>MappingTrackSelector (ExoPlayer library)</title>
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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">com.google.android.exoplayer2.trackselection</a></div>
<h2 title="Class MappingTrackSelector" class="title">Class MappingTrackSelector</h2>
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<li><a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">java.lang.Object</a></li>
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<li><a href="TrackSelector.html" title="class in com.google.android.exoplayer2.trackselection">com.google.android.exoplayer2.trackselection.TrackSelector</a></li>
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<li>com.google.android.exoplayer2.trackselection.MappingTrackSelector</li>
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<dd><code><a href="DefaultTrackSelector.html" title="class in com.google.android.exoplayer2.trackselection">DefaultTrackSelector</a></code></dd>
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<pre>public abstract class <span class="typeNameLabel">MappingTrackSelector</span>
extends <a href="TrackSelector.html" title="class in com.google.android.exoplayer2.trackselection">TrackSelector</a></pre>
<div class="block">Base class for <a href="TrackSelector.html" title="class in com.google.android.exoplayer2.trackselection"><code>TrackSelector</code></a>s that first establish a mapping between <a href="../source/TrackGroup.html" title="class in com.google.android.exoplayer2.source"><code>TrackGroup</code></a>s
 and <a href="../Renderer.html" title="interface in com.google.android.exoplayer2"><code>Renderer</code></a>s, and then from that mapping create a <a href="ExoTrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection"><code>ExoTrackSelection</code></a> for each
 renderer.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Class</th>
<th class="colLast" scope="col">Description</th>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="MappingTrackSelector.MappedTrackInfo.html" title="class in com.google.android.exoplayer2.trackselection">MappingTrackSelector.MappedTrackInfo</a></span></code></th>
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<div class="block">Provides mapped track information for each renderer.</div>
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<h3>Nested classes/interfaces inherited from class&nbsp;com.google.android.exoplayer2.trackselection.<a href="TrackSelector.html" title="class in com.google.android.exoplayer2.trackselection">TrackSelector</a></h3>
<code><a href="TrackSelector.InvalidationListener.html" title="interface in com.google.android.exoplayer2.trackselection">TrackSelector.InvalidationListener</a></code></li>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">MappingTrackSelector</a></span>()</code></th>
<td class="colLast">&nbsp;</td>
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<td class="colFirst"><code><a href="MappingTrackSelector.MappedTrackInfo.html" title="class in com.google.android.exoplayer2.trackselection">MappingTrackSelector.MappedTrackInfo</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getCurrentMappedTrackInfo()">getCurrentMappedTrackInfo</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the mapping information for the currently active track selection, or null if no
 selection is currently active.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#onSelectionActivated(java.lang.Object)">onSelectionActivated</a></span>&#8203;(<a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">Object</a>&nbsp;info)</code></th>
<td class="colLast">
<div class="block">Called by the player when a <a href="TrackSelectorResult.html" title="class in com.google.android.exoplayer2.trackselection"><code>TrackSelectorResult</code></a> previously generated by <a href="TrackSelector.html#selectTracks(com.google.android.exoplayer2.RendererCapabilities%5B%5D,com.google.android.exoplayer2.source.TrackGroupArray,com.google.android.exoplayer2.source.MediaSource.MediaPeriodId,com.google.android.exoplayer2.Timeline)"><code>TrackSelector.selectTracks(RendererCapabilities[], TrackGroupArray, MediaPeriodId, Timeline)</code></a> is activated.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code><a href="TrackSelectorResult.html" title="class in com.google.android.exoplayer2.trackselection">TrackSelectorResult</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#selectTracks(com.google.android.exoplayer2.RendererCapabilities%5B%5D,com.google.android.exoplayer2.source.TrackGroupArray,com.google.android.exoplayer2.source.MediaSource.MediaPeriodId,com.google.android.exoplayer2.Timeline)">selectTracks</a></span>&#8203;(<a href="../RendererCapabilities.html" title="interface in com.google.android.exoplayer2">RendererCapabilities</a>[]&nbsp;rendererCapabilities,
            <a href="../source/TrackGroupArray.html" title="class in com.google.android.exoplayer2.source">TrackGroupArray</a>&nbsp;trackGroups,
            <a href="../source/MediaSource.MediaPeriodId.html" title="class in com.google.android.exoplayer2.source">MediaSource.MediaPeriodId</a>&nbsp;mediaPeriodId,
            <a href="../Timeline.html" title="class in com.google.android.exoplayer2">Timeline</a>&nbsp;timeline)</code></th>
<td class="colLast">
<div class="block">Called by the player to perform a track selection.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>protected abstract <a href="https://developer.android.com/reference/android/util/Pair.html" title="class or interface in android.util" class="externalLink">Pair</a>&lt;@NullableType <a href="../RendererConfiguration.html" title="class in com.google.android.exoplayer2">RendererConfiguration</a>[],&#8203;@NullableType <a href="ExoTrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection" target="_top">ExoTrackSelection</a>[]&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#selectTracks(com.google.android.exoplayer2.trackselection.MappingTrackSelector.MappedTrackInfo,int%5B%5D%5B%5D%5B%5D,int%5B%5D,com.google.android.exoplayer2.source.MediaSource.MediaPeriodId,com.google.android.exoplayer2.Timeline)">selectTracks</a></span>&#8203;(<a href="MappingTrackSelector.MappedTrackInfo.html" title="class in com.google.android.exoplayer2.trackselection">MappingTrackSelector.MappedTrackInfo</a>&nbsp;mappedTrackInfo,
            int[][][]&nbsp;rendererFormatSupports,
            int[]&nbsp;rendererMixedMimeTypeAdaptationSupport,
            <a href="../source/MediaSource.MediaPeriodId.html" title="class in com.google.android.exoplayer2.source">MediaSource.MediaPeriodId</a>&nbsp;mediaPeriodId,
            <a href="../Timeline.html" title="class in com.google.android.exoplayer2">Timeline</a>&nbsp;timeline)</code></th>
<td class="colLast">
<div class="block">Given mapped track information, returns a track selection and configuration for each renderer.</div>
</td>
</tr>
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<h3>Methods inherited from class&nbsp;com.google.android.exoplayer2.trackselection.<a href="TrackSelector.html" title="class in com.google.android.exoplayer2.trackselection">TrackSelector</a></h3>
<code><a href="TrackSelector.html#getBandwidthMeter()">getBandwidthMeter</a>, <a href="TrackSelector.html#init(com.google.android.exoplayer2.trackselection.TrackSelector.InvalidationListener,com.google.android.exoplayer2.upstream.BandwidthMeter)">init</a>, <a href="TrackSelector.html#invalidate()">invalidate</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">Object</a></h3>
<code><a href="https://developer.android.com/reference/java/lang/Object.html#clone()" title="class or interface in java.lang" class="externalLink">clone</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang" class="externalLink">equals</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang" class="externalLink">finalize</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang" class="externalLink">getClass</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang" class="externalLink">hashCode</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang" class="externalLink">notify</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang" class="externalLink">notifyAll</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang" class="externalLink">toString</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://developer.android.com/reference/java/lang/Object.html?is-external=true#wait(long,int)" title="class or interface in java.lang" class="externalLink" target="_top">wait</a></code></li>
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<h4>MappingTrackSelector</h4>
<pre>public&nbsp;MappingTrackSelector()</pre>
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<a id="getCurrentMappedTrackInfo()">
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<h4>getCurrentMappedTrackInfo</h4>
<pre class="methodSignature">@Nullable
public final&nbsp;<a href="MappingTrackSelector.MappedTrackInfo.html" title="class in com.google.android.exoplayer2.trackselection">MappingTrackSelector.MappedTrackInfo</a>&nbsp;getCurrentMappedTrackInfo()</pre>
<div class="block">Returns the mapping information for the currently active track selection, or null if no
 selection is currently active.</div>
</li>
</ul>
<a id="onSelectionActivated(java.lang.Object)">
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<h4>onSelectionActivated</h4>
<pre class="methodSignature">public final&nbsp;void&nbsp;onSelectionActivated&#8203;(@Nullable
                                       <a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">Object</a>&nbsp;info)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="TrackSelector.html#onSelectionActivated(java.lang.Object)">TrackSelector</a></code></span></div>
<div class="block">Called by the player when a <a href="TrackSelectorResult.html" title="class in com.google.android.exoplayer2.trackselection"><code>TrackSelectorResult</code></a> previously generated by <a href="TrackSelector.html#selectTracks(com.google.android.exoplayer2.RendererCapabilities%5B%5D,com.google.android.exoplayer2.source.TrackGroupArray,com.google.android.exoplayer2.source.MediaSource.MediaPeriodId,com.google.android.exoplayer2.Timeline)"><code>TrackSelector.selectTracks(RendererCapabilities[], TrackGroupArray, MediaPeriodId, Timeline)</code></a> is activated.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="TrackSelector.html#onSelectionActivated(java.lang.Object)">onSelectionActivated</a></code>&nbsp;in class&nbsp;<code><a href="TrackSelector.html" title="class in com.google.android.exoplayer2.trackselection">TrackSelector</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>info</code> - The value of <a href="TrackSelectorResult.html#info"><code>TrackSelectorResult.info</code></a> in the activated selection.</dd>
</dl>
</li>
</ul>
<a id="selectTracks(com.google.android.exoplayer2.RendererCapabilities[],com.google.android.exoplayer2.source.TrackGroupArray,com.google.android.exoplayer2.source.MediaSource.MediaPeriodId,com.google.android.exoplayer2.Timeline)">
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<h4>selectTracks</h4>
<pre class="methodSignature">public final&nbsp;<a href="TrackSelectorResult.html" title="class in com.google.android.exoplayer2.trackselection">TrackSelectorResult</a>&nbsp;selectTracks&#8203;(<a href="../RendererCapabilities.html" title="interface in com.google.android.exoplayer2">RendererCapabilities</a>[]&nbsp;rendererCapabilities,
                                              <a href="../source/TrackGroupArray.html" title="class in com.google.android.exoplayer2.source">TrackGroupArray</a>&nbsp;trackGroups,
                                              <a href="../source/MediaSource.MediaPeriodId.html" title="class in com.google.android.exoplayer2.source">MediaSource.MediaPeriodId</a>&nbsp;mediaPeriodId,
                                              <a href="../Timeline.html" title="class in com.google.android.exoplayer2">Timeline</a>&nbsp;timeline)
                                       throws <a href="../ExoPlaybackException.html" title="class in com.google.android.exoplayer2">ExoPlaybackException</a></pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="TrackSelector.html#selectTracks(com.google.android.exoplayer2.RendererCapabilities%5B%5D,com.google.android.exoplayer2.source.TrackGroupArray,com.google.android.exoplayer2.source.MediaSource.MediaPeriodId,com.google.android.exoplayer2.Timeline)">TrackSelector</a></code></span></div>
<div class="block">Called by the player to perform a track selection.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="TrackSelector.html#selectTracks(com.google.android.exoplayer2.RendererCapabilities%5B%5D,com.google.android.exoplayer2.source.TrackGroupArray,com.google.android.exoplayer2.source.MediaSource.MediaPeriodId,com.google.android.exoplayer2.Timeline)">selectTracks</a></code>&nbsp;in class&nbsp;<code><a href="TrackSelector.html" title="class in com.google.android.exoplayer2.trackselection">TrackSelector</a></code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>rendererCapabilities</code> - The <a href="../RendererCapabilities.html" title="interface in com.google.android.exoplayer2"><code>RendererCapabilities</code></a> of the renderers for which tracks
     are to be selected.</dd>
<dd><code>trackGroups</code> - The available track groups.</dd>
<dd><code>mediaPeriodId</code> - The <a href="../source/MediaSource.MediaPeriodId.html" title="class in com.google.android.exoplayer2.source"><code>MediaSource.MediaPeriodId</code></a> of the period for which tracks are to be selected.</dd>
<dd><code>timeline</code> - The <a href="../Timeline.html" title="class in com.google.android.exoplayer2"><code>Timeline</code></a> holding the period for which tracks are to be selected.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A <a href="TrackSelectorResult.html" title="class in com.google.android.exoplayer2.trackselection"><code>TrackSelectorResult</code></a> describing the track selections.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../ExoPlaybackException.html" title="class in com.google.android.exoplayer2">ExoPlaybackException</a></code> - If an error occurs selecting tracks.</dd>
</dl>
</li>
</ul>
<a id="selectTracks(com.google.android.exoplayer2.trackselection.MappingTrackSelector.MappedTrackInfo,int[][][],int[],com.google.android.exoplayer2.source.MediaSource.MediaPeriodId,com.google.android.exoplayer2.Timeline)">
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<h4>selectTracks</h4>
<pre class="methodSignature">protected abstract&nbsp;<a href="https://developer.android.com/reference/android/util/Pair.html" title="class or interface in android.util" class="externalLink">Pair</a>&lt;@NullableType <a href="../RendererConfiguration.html" title="class in com.google.android.exoplayer2">RendererConfiguration</a>[],&#8203;@NullableType <a href="ExoTrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection">ExoTrackSelection</a>[]&gt;&nbsp;selectTracks&#8203;(<a href="MappingTrackSelector.MappedTrackInfo.html" title="class in com.google.android.exoplayer2.trackselection" target="_top">MappingTrackSelector.MappedTrackInfo</a>&nbsp;mappedTrackInfo,
                                                                                                                    <a href="../RendererCapabilities.Capabilities.html" title="annotation in com.google.android.exoplayer2">@Capabilities</a>
                                                                                                                    int[][][]&nbsp;rendererFormatSupports,
                                                                                                                    <a href="../RendererCapabilities.AdaptiveSupport.html" title="annotation in com.google.android.exoplayer2">@AdaptiveSupport</a>
                                                                                                                    int[]&nbsp;rendererMixedMimeTypeAdaptationSupport,
                                                                                                                    <a href="../source/MediaSource.MediaPeriodId.html" title="class in com.google.android.exoplayer2.source">MediaSource.MediaPeriodId</a>&nbsp;mediaPeriodId,
                                                                                                                    <a href="../Timeline.html" title="class in com.google.android.exoplayer2">Timeline</a>&nbsp;timeline)
                                                                                                             throws <a href="../ExoPlaybackException.html" title="class in com.google.android.exoplayer2">ExoPlaybackException</a></pre>
<div class="block">Given mapped track information, returns a track selection and configuration for each renderer.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>mappedTrackInfo</code> - Mapped track information.</dd>
<dd><code>rendererFormatSupports</code> - The <a href="../RendererCapabilities.Capabilities.html" title="annotation in com.google.android.exoplayer2"><code>RendererCapabilities.Capabilities</code></a> for ach mapped track, indexed by
     renderer, track group and track (in that order).</dd>
<dd><code>rendererMixedMimeTypeAdaptationSupport</code> - The <a href="../RendererCapabilities.AdaptiveSupport.html" title="annotation in com.google.android.exoplayer2"><code>RendererCapabilities.AdaptiveSupport</code></a> for mixed MIME type
     adaptation for the renderer.</dd>
<dd><code>mediaPeriodId</code> - The <a href="../source/MediaSource.MediaPeriodId.html" title="class in com.google.android.exoplayer2.source"><code>MediaSource.MediaPeriodId</code></a> of the period for which tracks are to be
     selected.</dd>
<dd><code>timeline</code> - The <a href="../Timeline.html" title="class in com.google.android.exoplayer2"><code>Timeline</code></a> holding the period for which tracks are to be selected.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>A pair consisting of the track selections and configurations for each renderer. A null
     configuration indicates the renderer should be disabled, in which case the track selection
     will also be null. A track selection may also be null for a non-disabled renderer if <a href="../RendererCapabilities.html#getTrackType()"><code>RendererCapabilities.getTrackType()</code></a> is <a href="../C.html#TRACK_TYPE_NONE"><code>C.TRACK_TYPE_NONE</code></a>.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../ExoPlaybackException.html" title="class in com.google.android.exoplayer2">ExoPlaybackException</a></code> - If an error occurs while selecting the tracks.</dd>
</dl>
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